Why are my SVG imports so small?
The Grid Plane in Blender by default is 1m X 1m for every square. When you make a Vector drawing usually your Vector Editor (Illustrator / Inkscape) will be set to something standard like A4 or A3. The longest side of an A4 is about 30 cm. (one third of a meter), an svg the size of A4 would look like this in your Vector Editor.



Imported in Blender that looks like this:



SVG drawings are based on Scalar values, but when you use Vector graphics in a layout program or import into something like Blender the program needs to know what kind of world-dimensions the shape has. It's either pixels, cm, inches, meters, etc. 

In Illustrator  

You might have a tick-box checked to make your .svg export 'responsive'. From what I read this will omit any width / height / units information -- it assumes you want to use the .svg on the web or something. For more insight about how Illustrator saves / exports .svg files I recommend their built-in manual or support site.

In Blender  

currently when the default SVG importer (io_curve_svg) encounters an .svg which has no dimensions or 'SVGUnits' it will treat the coordinates the same as it would if you had set the units to pixels in your Vector Editor.